Axiom Home Page Forums General Discussion Advice from Axiom Owners My Superchunk Bass Trap Project, Graphs included

Well Randy, I'm suitably dizzy from looking at all the response curves and trying to equate the four or so different room effects with them. The most prominent features are still the dips around 140-150Hz(wavelength about 8') and 240-250Hz(wavelength about 5'). At those frequencies the sub shouldn't have a significant cancellation effect on the mains, so the likely problem is main driver cone to room surface distance of about .25 to .30 wavelength. Following up on John B.'s reply, it appears that your M60 cone centers are about 7"+15"+4"=26" from the wall behind, so that would fall into the quarter-wavelength area around 140Hz. It might be interesting to see if moving them out at least a foot farther had a significant effect on the frequency of the lower dip. As to the higher frequency dip, possibly the floor? Get rid of it!

Of some interest relating to the alternative(or realistically, complementary)electronic room equalization process is the article by Mark Sanfilipo in Audioholics. This appears to be by far the most thorough analysis(the math doesn't necessarily have to be studied)of the Audyssey system used in some Denons and Onkyos, and explains some of the difficulties in getting good results. The graphs are interesting.